Summary of Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2013	May 31, 2012
Schedule of Accrued Liabilities [Line Items]
Payroll and other compensation expenses	$ 32,093	$ 27,871
Insurance accruals	5,385	4,388
Property, sales and other non-income related taxes	2,385	1,966
Other	9,302	4,267
Total	$ 49,165	$ 38,492

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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